The "spacer" you are referring to is the BM9 (at least I think thats the number) out of the motor parts bag - it's the only spare blue anodised part you should have left after the car has been built so its easy to spot.
The bearings are the infuriatingly uncommon 950 type and relatively speaking they are flippin expensive. I think I paid £5+ for mine as the only ones I could find were genuine Tamiya ones and you only get 2 in a pack as well.
To be honest I am not sure the "tensioners" are strictly necessary as I ran my car without them with a 5.5T b/less motor and had no problems with belt slippage. They don't actually tension the belt itself, they're just there to prevent it leaping away from the centre drive-pulley under heavy loading/unloading. I only put them on as I'd already ordered them beforehand - not realising I needed some 950 bearings too - and when the bearings finally arrived it seemed a shame to leave them in the spares box.
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